Agree with the advice given above: your best to leave it at least 4 hours after running to try to sleep and some may need much more time then that, up to 8 hours even.
Check what your eating and drinking in the day and when you do this, if your carb heavy in the morning and then eating a lot of heavy protein in the evenings (meat, tofu for example) you could try swapping this around or just adding more carbs to the evening as carbohydrate heavy meals normally make people feel drowsy after about 20 mins. Dairy can also help, milk is a good idea and if your running in the early evening is known for its fantastic post exercise properties.
Caffiene also makes a difference as I'm sure you know. If you must have caffiene (coke/diet coke, coffee, black or green tea, chocolate and some pain killers-read the pack) try to take it earlier on in the day and limit what you do take. You could build up your tolerance but it wont happen overnight. Any sort of alcohol will also keep you awake and funnily enough ginger also can as it is a stimulant as is grapefruit and oranges which can also affect your sleep (not in everyone, just in some). Try not to take these things within a few hours of sleeping.
If your finding your feeling more energetic and the energy is not dying down then do something with it. If you finish your run and feel you could do more you have many options open to you. Running more, building up resistance with weights, yoga, Pilataes is well known for being helpful for runners as it builds up your core stability which can help your posture and so technique. Try to plan things where this energy could come in useful, things like gardening, helping out an elderly relative or a very young relative! Go food shopping and walk home -or walk as much as you can, treat the energy as a gift and use it to its full advantage; running obviously works well for you!
If your lying in bed awake, get a book to read, something fairly bland or in short stories (Angela Carters Fairy Taless is a good book and not going to keep you awake in fear gripped unable to sleep, just steer clear of thrillers and action type books with many pictures- try to get your head to build up pictures.)
If books are not helping, get up and do something but make sure it does not involve technologu as technology can have a stimulating effect and keep you awake.
Relaxation techniques can be helpful for some but if thats not your style my best advice is to try lying with your feet and legs flat upright against a wall for anything up to 30 mins. This probably wont do anything for or against your sleep but will help with water retention which naturally gathers in your lower legs as the day goes on and means you get up feeling just a bit more refreshed then if you had just spent the night fully awake but lying flat. Helps me anyway!